The UPU's motto was: "Remove the causes and abolish the custom of war, establish and live the principles of peace."[12]
On a hill overlooking the Mystic River near Mystic, Connecticut, the UPU owned a grove and built a "Peace Temple" that could seat 1,000 people for annual summer gatherings that attracted such noted speakers as William Lloyd Garrison and Julia Ward Howe. The grove eventually was mortgaged to pay for UPU programs and publications and then sold in 1914 to Mary Jobe Akeley.[13] The property is now maintained as the Peace Sanctuary nature preserve, open daily from dawn to dusk.
Records of the UPU, including correspondence, minutes, financial records, publications, and memorabilia, are housed at the Swarthmore College Peace Collection.[14]
^"Alfred H. Love"(PDF). New York Times. June 30, 1913. Retrieved 31 December 2016. Alfred H. Love, President of the Universal Peace Union since its formation in 1866 ...
^Alfred H. Love (September 1912). "Memorial Tribute to Frederic Passy". The Peacemaker. Vol. 31. Universal Peace Union. pp. 177–183. Retrieved 31 December 2016.